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  Results 1 to 10 of 46
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   Oasis  
Subject: Geography
    a fertile tract in a desert (where the water table approaches the surface)


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   occluded front (occlusion)  
Subject: The Earth
    A complex frontal system that ideally forms when a cold front overtakes a warm front. When the air behind the front is colder than the air ahead of it, the front is called a cold occlusion. When the air behind the front is milder than the air ahead of it, it is called a warm occlusion.
 
 
  
   Occultation   
Subject: Geology
    The disappearance of light resulting when one object passes behind an apparently larger one. For example, the passage of Uranus in front of a distant star. Reference: Tarbouk, E.J. & F.K. Lutgens, (2006), EARTH, 8th edition, Pearson Education International.
 
 
  
   Ocean   
Subject: Geography
    A body of saline water found occupying all or part of the Earth's ocean basins. There are six recognized oceans: North Atlantic, South Atlantic, North Pacific, South Pacific, Indian, and Arctic.


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   ocean basin  
Subject: The Earth
    A low part of the lithosphere lying between the continental masses.
 
 
  
   ocean mixing  
Subject: The Earth
    Processes that involve rates of advection, upwelling/ downwelling, and eddy diffusion and that determine how rapidly excess atmospheric carbon dioxide can be taken up by the oceans.
 
 
  
   Oceanic crust  
Subject: Geology
    The crustal rocks that underlie the world's deep ocean basins, consisting primarily of basalt; oceanic crust is thin and dense compared to continental crust. Reference : Skinner B.J., S.C.Porter & J.Park (2004), DYNAMIC EARTH, 5th edition, Jon Wiley & Sons.
 
 
  
   oceanic front  
Subject: The Earth
    A boundary that separates masses of water with different temperatures and densities.
 
 
  
   Oceanic plateau   
Subject: Geology
    An extensive region on the ocean floor composed of thick accumulations of pillow basalts and other mafic rocks that in some cases exceed 30 kilometers in thickness. Reference: Tarbouk, E.J. & F.K. Lutgens, (2006), EARTH, 8th edition, Pearson Education International.
 
 
  
   Oceanic ridge   
Subject: Geology
    See Mid-ocean ridge. Reference: Tarbouk, E.J. & F.K. Lutgens, (2006), EARTH, 8th edition, Pearson Education International.
 
 
  
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